Is there a way to locate where options are in the interface?
If it's a keyboard shortcut you are looking for, you can try searching for the tool in CtrlAltU> User preferences > Input:



As for external resources, you can try the wiki, but beware that some parts are incomplete/out of date.

Another external resource which works well is google, usually searching for something like "blender &lt;function name>" will get you results.

However, if all else fails you can always ask here ;)